three men for each tribe

18:4 three men for each tribe. Five of the tribes had already been awarded their lots (Judah, Ephraim, Manasseh, Reuben, Gad), so presumably only the seven tribes remaining were represented on this committee. It is obvious that the seven subdivisions which they described were not equal in geographical area, so they presumably tried to take other factors into consideration in arriving at their optimum divisions.